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| Effects of Inorganic Arsenic on Seed Germination and Photosynthetic Characteristics of Various Rice Cultivars |
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| KeyWord:arsenic; rice; germination rate; photosynthetic characteristics |
| Author Name | Affiliation | | LI Ren-ying | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | SHEN Xiao-hui | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | ZHANG Yao-hong | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | ZHOU Zhi-gao | State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | XIE Xiao-jin | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | LI Ying-xue | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | XU Xiang-hua | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | QIN Zheng-jie | Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: |
| It is important to screen out rice cultivars that are higher tolerance and lower accumulation for arsenic（As）. We investigated the effects of inorganic As on seed germination and photosynthetic characteristics of nine rice cultivars collected across Jiangsu province using seed germination and seedling hydroponic experiments. Germination rates of rice seeds and growth of rice spout and root were stimulated under As concentrations less than 0.6 mg·L-1, but inhibited at As greater than 0.8 mg·L-1. However, the initial As concentrations that inhibited rice germination varied with rice cultivars. They were 2.0 mg·L-1, 3.0 mg·L-1 and >3.0 mg·L-1 As for Wuyunjing 24, Zhendao 16 and Liangyou 6326, respectively. However, these As concentrations were <1.0 mg·L-1 for the rest. Compared with the control, the lengths of spout and root of Ningjing 1, Nanjing 44, Zhendao16, Wuyunjing 24 and Liangyou 6326 were decreased slightly, while decreased greatly for other rice cultivars and even died at As concentration of 3.0 mg·L-1. Under As stress, SPAD values of rice leaves didn′t significantly decreased except Ningjing 1 and Nanjing 44. Photosynthetic characteristics of nine rice cultivars responded differently to As stress of 24 h. Net photosynthenic rates of rice were increased except Suliangyou 124 and Yanliangyou 888. Intercellular CO2 concentrations, conductance to H2O, and transpiration rate of most of rice cultivars were decreased under As stress. The present results provide important information for screening out rice cultivars with high tolerance to As. |
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